Vibration dampening apparatus



Filed May 3, 1937 Patented Sept. 26, 1*?39 UNITED l STATES PATENT OFFICE VIBRATION DAMPENING APPARATUS Siegfried Rosenzweig, Long Island City, N. Y. Application May 3, 1937, Serial No. 140,540

2 Claims. (Cl. 2484-20) This invention relates to a method of and an improved means for resiliently mounting heavy machine foundations for vibration dampening purposes, and has generally in view to provide an 5 improved vibration dampening means of the general character described and claimed in my prior Patent No. 2,093,930 dated September 21, 1937, and to provide a novel method for the application of such means to either existing. or newly l constructed machine foundations.

As in the case of my prior invention, described and claimed in my prior application above referred to, an object of the present invention is to provide a vibration dampening means which lends l itself to practical, embodimentvin poured concrete machine foundations; which serves effectively to l reinforce such foundations, and which involves a combination and arrangement of elements whereby the resilient vibration dampening devices :to thereof, preferably of the coil spring type, are

readily laccessible for adjustments and repairs.

A special object of the present invention is to provide for the utilization of pairs of known structural shapes, preferably channel members of as relatively light weight, to obtain materially increased reinforcement and stiffening of foundations and greater depth of spring accommodating space within narrower limits laterally, all with a saving of metal, as compared with the arrange- .im ment illustrated in myxaforesaid prior application.

Another special object of the present invention is 4to provide a vibration dampening means for lembodiment in newly poured concrete machine foundations, or for attachment to existingfount5 dations, which means is of such design that, in either case, the machine foundation may be either in part or in its entirety suspended from said means.

Another special' object of the invention is to u() provide "vibration dampening means having the special fatures and advantages stated and which, addition lly, embodies a construction permitting the use \of cork or other suitable material to resiliently resist horizontal `movements of the 45 machine foundation relative to the fixed floor or base .structure upon' which itis supported.

With the foregoing and other objects in view, which will become more fully apparent'as the nature of the invention is better understood, the

50 same consists in the novel features of construction, combination andarrangement of parts, and in the novel installation method involved, as will be hereinafter more fully described, illustrated in the 'accompanying drawing and deiiped 55 in the appended claims.

In the accompanying drawing, wherein like characters of reference denote corresponding parts in the different views:

v Figure 1 is a side elevation, partly in section,

illustrating the present method of applying the present dampening means to an existing machine foundation; and

Figure 2 is a section on the line 2--2 of Fig. 1.

Referring to the drawing in detail, A designates, generally, a machine foundation in the form of a concrete slab, B designates, generally a machine mounted on said foundation, and C designates a floor or other base structure on which the foundation A is supported.

Suitably fastened rigidly to said foundation, preferably upon the top thereof as illustrated in Figs. l and 2, are pairs of channel members I0, Il) which are disposed horizontally in spaced apart, 'parallel relationship, with their webs II extending vertically and their ilanges I2 extending outwardly and which are rigidly connected together 'at suitable locations by pairs of vertically disposed plates I3, I3, which plates, in cooperation with the webs of said members to which they are welded or otherwise suitably secured, define houslngsaccommodating coil springs I4 through which said members and the foundation A are resiliently supportedupon the iioor or other base structure C.

Ordinarily two or more pairs of the channel members I0, I0 are employed and these may be disposed in any desired relationship to each other, depending upon the size and shape of the foundation A and other considerations in the case of any particular installation.

Fastened to the tops oi.' the channel members I0, I0 of each pair and bridging the space between said channel members, over each ofthe spring accommodating housings aforementioned, is a cap'member I6 through the top wall of which is threaded a vertically disposed bolt I'I which, at its bottom, bears upon aaplate I 8 seated upon the tops of the vertically disposed coil springs I4, of which there may be any suitable number of any desired st ze and strength.

At their bottoms the coil springs Il are seated upon a base member I9 which is bolted or otherwise suitably fastened to the oor or base structure C.

The bolts I1 serve as screw jacks the members IlI'and the slab A to a desired elevation above the floor or other basestructure C and also for leveling the slab, and, as i's obvious,

when the slab A is supported by said springs the latter act as vibration absorbers substantially Vpreventing the transmission of vibration from foundation mass A or simply are fastened to saidmass, the latter may be constructed on the site where a machine is to be located and the bolts H may be employed as screw jacks for lifting said.

mass following its completion.

There are many existing machine foundations in the form of slabs'which rest either directly upon a oor or other base structure or upon an interposed layer of cork or equivalent resilient material intended to prevent the transmission of vibration from the foundation to the floor or base structure, and in many of such cases it is quite desirable and advantageous to employ springs for resiliently supporting the foundations. 'I'he present construction lends itself admirably to this purpose as will be apparent by reference to Figs. 8 and 9 of the drawing. Ordinarily the machine is fastened to the foundation by means of nuts 23 threaded on the upper ends of studs 24 which are embedded in the foundation. Said nuts are removed and by any suitable means the machine B is lifted on' of the foundation. Then, upon the top of the foundation, are disposed any suitable number of pairs of the members I0, I0 having their ends extending beyond the sides, or ends, as the case may be, of the foundation. At the ends of the members I0, I0 the same are provided with spring units as hereinbefore described, and either prior or subsequent to the placing of the members I0, Il) on the foundation, there are erected upon the oor or other base structure suitable columns, abutments or the like 25 to underlie the ends of the members I 0, I0 and to serve as supports -for the base members I9 of the spring units. If desired, the spaces between the members l0, IU of each pair, and between the different pairs of said members, may be filled with concrete. In any event, extension studs 26 are fastened to the studs 24 and the machine B then is lowered until it rests upon the members I0 and the connecting cross members l5 if the latter are provided. The nuts 23 then are applied to the extension studs to fasten the machine securely upon the members I0, I0 and to the foundation A. Thereafter, the bolts l1 of the spring units are manipulated as screw jacks to lift the foundation and the machine off of the floor, cork or the like and to level the machine, with the result that there is obtained a spring suspension of the present desirable type for the machine and its foundation.

Without further description it is thought that the features and advantages of the invention will be readily apparent to those skilled in the art, and it will of course be understood that changes in the form, proportion and minor details of construction may be resorted tol Without departing from the spirit of the invention and scope of the appended claims.

I claim:

1. An improved vibration dampening means for mounting a machine upon a floor or the like.

comprising, in combination with opposite abutments, a machine foundation slab between the abutments, structural members arranged on the slab and having projecting ends overlying the abutments, means for securing the machine on the structural members and the latter to the slab, and vibration dampening units fitted to the said projecting ends of the structural members and cooperating with the abutments to hold the slab in suspension.

2. An improved vibration dampening means for mounting a machine upon a floor or the like, comprising, in combination with opposite abutments, a machine foundation slab between the abutments, structural members arranged on the slab and having projecting ends overlying the abutments, means for securing the machine on the structural members and the latter to the slab, and vibration dampening units fitted to the said projecting ends of the structural members and cooperating with the abutments to hold the slab in suspension, said units having adjusting means for raising. and/or lowering the structural members and the parts carried thereby.

SIEGFRIED ROSENZWEIG. 

